package sh.nym.irisglass;

import android.app.Service;
import android.content.Intent;
import android.content.SharedPreferences;
import android.os.HandlerThread;
import android.os.IBinder;
import android.preference.PreferenceManager;
import android.util.Log;

import org.json.JSONException;

import java.util.List;

public final class BleLinkService extends Service implements BleCentralClient.Callback {
    private static final String PREF_KEY_LAST_WINNER_ID = "winner_last_id";

    private HandlerThread bleThread;
    private BleCentralClient client;

    @Override
    public void onCreate() {
        super.onCreate();
        bleThread = new HandlerThread("ble-link");
        bleThread.start();
        client = new BleCentralClient(getApplicationContext(), this, bleThread.getLooper());
    }

    @Override
    public int onStartCommand(Intent intent, int flags, int startId) {
        String action = intent != null ? intent.getAction() : null;
        if (Constants.ACTION_RESCAN.equals(action)) {
            client.rescan();
        } else {
            client.start();
        }
        return START_STICKY;
    }

    @Override
    public void onDestroy() {
        try {
            if (client != null) client.stop();
        } catch (Throwable ignored) {
        }
        if (bleThread != null) {
            bleThread.quit();
            bleThread = null;
        }
        super.onDestroy();
    }

    @Override
    public IBinder onBind(Intent intent) {
        return null;
    }

    @Override
    public void onStatus(String status, String lastErrorOrNull, boolean shouldRender) {
        Log.i(Constants.TAG_BLE, "Status: " + status + (lastErrorOrNull != null ? (" (" + lastErrorOrNull + ")") : ""));
        Intent i = new Intent(Constants.ACTION_BLE_STATUS);
        i.putExtra(Constants.EXTRA_BLE_STATUS, status);
        i.putExtra(Constants.EXTRA_BLE_ERROR, lastErrorOrNull);
        sendBroadcast(i);
    }

    @Override
    public void onConnected() {
        Intent i = new Intent(Constants.ACTION_BLE_STATUS);
        i.putExtra(Constants.EXTRA_BLE_STATUS, "Connected");
        sendBroadcast(i);
    }

    @Override
    public void onPing() {
    }

    @Override
    public void onFeedJson(String json) {
        if (json == null) return;

        try {
            FeedEnvelope env = FeedParser.parseEnvelope(json);
            HudState.get().setFeed(env.items, env.meta, true);
            maybeNudgeWinnerChanged(env);
        } catch (JSONException e) {
            Log.w(Constants.TAG_FEED, "Parse error: " + e);
            Intent i = new Intent(Constants.ACTION_BLE_STATUS);
            i.putExtra(Constants.EXTRA_BLE_STATUS, "Connected");
            i.putExtra(Constants.EXTRA_BLE_ERROR, "Feed parse error: " + e.getMessage());
            sendBroadcast(i);
        }
    }

    private void maybeNudgeWinnerChanged(FeedEnvelope env) {
        if (env == null) return;

        String winnerId = env.meta != null ? env.meta.winnerId : null;
        if (winnerId == null || winnerId.length() == 0) {
            List<FeedItem> active = env.activeItems();
            if (!active.isEmpty()) {
                FeedItem first = active.get(0);
                if (first != null) winnerId = first.id;
            }
        }
        if (winnerId == null || winnerId.length() == 0) return;

        SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(getApplicationContext());
        String lastWinnerId = prefs.getString(PREF_KEY_LAST_WINNER_ID, null);
        if (lastWinnerId == null) {
            prefs.edit().putString(PREF_KEY_LAST_WINNER_ID, winnerId).apply();
            Log.i(Constants.TAG_HUD, "Winner nudge: seeded last winner id=" + winnerId);
            return;
        }
        if (winnerId.equals(lastWinnerId)) return;

        prefs.edit().putString(PREF_KEY_LAST_WINNER_ID, winnerId).apply();
        Log.i(Constants.TAG_HUD, "Winner nudge: winner changed " + lastWinnerId + " -> " + winnerId);

        Intent i = new Intent(getApplicationContext(), HudService.class);
        i.setAction(Constants.ACTION_WINNER_CHANGED);
        i.putExtra(Constants.EXTRA_WINNER_ID, winnerId);
        startService(i);
    }
}